For office wear (button down, blouse, pants and blazers), I go for quality because I tend to repeat clothes at office. Good quality clothes can last a lifetime with proper care even if used often.
For party/formal dresses and denim jeans, I go for quality also because I don't want to buy and wear a dress just for a single occasion (except for the wedding gown, lol). Denims are wardrobe staples and I don't want to hoard a lot for I don't have a huge closet.
That's why I don't have a single bright colored jeans that seems to be fad lately.
For shirts and tops, I go for quality and quantity. I sometimes end up using shirts as pambahay.
For shoes, I go for quantity and quality. I love shoes so I tend to buy a lot but I always make sure that they are of good quality.